<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>后台管理页面</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .header{
            width: 100%;
            height: 60px;
            background-color:#369;
        }
    </style>
</head>
<body>
<div class="header"></div>
<h3>添加文章</h3>
</body>

</html>